move onLoad() to onAttach() for CRAN

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: aws.ec2metadata
 Type: Package
 Title: Get EC2 Instance Metadata
-Version: 0.1.3
+Version: 0.1.4
 Date: 2018-04-02
 Authors@R: c(person("Thomas J.", "Leeper", role = c("aut", "cre"),
                     email = "thosjleeper@gmail.com"))

NEWS.md

@@ -1,12 +1,16 @@
-# CHANGES TO aws.ec2metadata 0.1.3
+# aws.ec2metadata 0.1.4
+
+* Previous `.onLoad()` functionality added in 0.1.3 is now moved to `.onAttach()` to comply with CRAN policy.
+
+# aws.ec2metadata 0.1.3
 
 * Added a function `instance_document()` that returns a list of the ["instance identity document"](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-identity-documents.html) information. This is useful for identifying the region an instance is running in.
 * When the package is loaded on an EC2 instance (as identified by `is_ec2()` during package load), the package attempts to set the `AWS_DEFAULT_REGION` environment variable if it has not already been specified. This helps handle request signing.
 
-# CHANGES TO aws.ec2metadata 0.1.2
+# aws.ec2metadata 0.1.2
 
 * Added a function `is_ec2()` that returns a logical based on whether metadata is retrievable.
 
-# CHANGES TO aws.ec2metadata 0.1.1
+# aws.ec2metadata 0.1.1
 
 * Initial release.

R/onLoad.R

@@ -1,4 +1,4 @@
-.onLoad <- function(libname, pkgname) {
+.onAttach <- function(libname, pkgname) {
     if (is_ec2() && Sys.getenv("AWS_DEFAULT_REGION") == "") {
         reg <- try(instance_document()$region, silent = TRUE)
         if (!inherits(reg, "try-error")) {

README.md

@@ -41,10 +41,10 @@ install.packages("aws.ec2metadata", repos = c(cloudyr = "http://cloudyr.github.i
 Or, to pull a potentially unstable version directly from GitHub:
 
 ```R
-if (!require("ghit")) {
-    install.packages("ghit")
+if (!require("remotes")) {
+    install.packages("remotes")
 }
-ghit::install_github("cloudyr/aws.ec2metadata")
+remotes::install_github("cloudyr/aws.ec2metadata")
 ```
 
 ---